Sökning: "Harmonic analysis"

Visar resultat 11 - 15 av 109 uppsatser innehållade orden Harmonic analysis.

1. 11. The Uniformization Theorem

   Kandidat-uppsats, Lunds universitet/Matematik LTH; Lunds universitet/Matematik (naturvetenskapliga fakulteten)

   Författare :Nikita Zozoulenko; [2021]
   Nyckelord :complex analysis; riemann surface; analytic functions; holomorphic functions; differential geometry; harmonic; subharmonic; perron; analysis; Mathematics and Statistics;

   Sammanfattning : In this bachelor's thesis we provide a self contained proof of the Uniformization Theorem. It states that a simply connected Riemann surface is conformally equivalent to either the complex plane C, the unit disk D, or the Riemann sphere C^*. LÄS MER

3. 12. Harmonic Emissions in Microgrids

   Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Industriell elektroteknik och automation

   Författare :Lejla Alibegovic; Emelie Freiland Paulsson; [2021]
   Nyckelord :Harmonics; microgrid; local energy system; NEPLAN; Technology and Engineering;

   Sammanfattning : “Affordable and clean energy” is EUs 7th Sustainable Development Goal and includes an increase of renewable energy generation in the global energy mix. A lot of the responsibility falls on the energy sector to transform and obtain solutions for a more sustainable future. LÄS MER

4. 13. Field Oriented Current Control with Harmonic Injection in a Six-Phase Induction Machine

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Xinyue Shan; [2021]
   Nyckelord :Multi-phase machine; asymmetrical six-phase induction machine; harmonic plane decomposition; indirect rotor field oriented control; parameter estimation; Flerfasmaskin; asymmetrisk sexfasinduktionsmaskin; harmonisk plan sönderdelning; indirekt rotorfältorienterad styrning; parameteruppskattning;

   Sammanfattning : As a new type of machine, the multi-phase machine has the advantages ofhigher power rating, higher fault tolerance capability and more degrees offreedom to control compared with the traditional machine. Aiming at runninga multi-phase machine with different phase-pole configurations smoothly,a new method called harmonic plane decomposition is presented. LÄS MER

5. 14. Beyond Mean-Field Description of Bose-Einstein Condensate

   Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

   Författare :Daniel Larsson Persson; [2021]
   Nyckelord :Bose-Einstein condensate; BEC; dilute; non-uniform; quantum depletion; second quantisation; mean field; mean-field approximation; the Gross-Pitaevskii equation; Gross-Pitaevskii; perturbation theory; many-body perturbation theory; Rayleigh-Schrödinger perturbation theory; Rayleigh-Schrödinger; Epstein-Nesbet perturbation theory; Epstein-Nesbet; quantum ring; Physics and Astronomy;

   Sammanfattning : This thesis work is on the theoretical description of dilute Bose-Einstein condensates (BEC) that are non-uniform, meaning that more than one single-particle state is occupied. This phenomenon is usually called quantum depletion. LÄS MER

7. 15. Analysis of Different Switching Patterns to Minimize Losses in a Six- Phase Drive for Marine Application

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Yanick Patrick Frei; [2021]
   Nyckelord :Multiphase machines; Switching patterns; Winding conduction losses; Converter losses; MATLAB SIMULINK; Flerfasmaskiner; Modulatorer; Spolledningsförluster; Omvandlarförluster; MATLAB SIMULINK;

   Sammanfattning : Multiphase machines have gained a lot of popularity during the recent years, as they offer certain benefits over their three- phase counterparts. This work investigates the losses of a six- phase drive system for a marine application when supplied by four different switching patterns (also referred to as modulators). LÄS MER